Locomotive.



Patentedy Nov. 2|, |899.

J. M. THUMPSON.

LCOMOTIVE.

(Application med may 1o, 1899.)

3 Sheets--Sheet (No Model.)

INVEWPEHRl wlvmff S 2H QSE'E' jmwa.

No. 637,430. Patented Nov. 2|, i899. J. M. THOMPSON.

LOCBMOTIVE.

(Application lud May l0. 1899.) -Ulo Model.) 3 Sheets--Sheet 2,

No. 637,430. Patented Nov. 2l, |899.

J. M. THOMPSON.

LOCOMOTIVE.

(Application led May 10. 1899.) (N0 MOdBL) 3 Sheets-Sheet 3 UNITEDSTATES ATENT EEICE.

JESSE M. THOMPSON," OE CHICAGO, ILLINOIS.

LOCONIOTIVE.

SPECIFICATION forming part of Letters Patent No. 637,430, dated November21, 1899.

Application ned May 10,1899. serial No. 716,215. (No model.)

To all whom t may concern:

Be it known that I, JESSE M. THOMPSON, a citizen of the United States ofAmerica, residing at Chicago, in the county of Cook and State ofIllinois, have invented certain new and useful Improvements inLocomotives, of which the following is a specification.

The object of my invention is to provide a locomotive wherein acontinuous running engine may be used and the power developed therebytransmitted to the axles of the locomotive at a varying speed.

It is a well-known fact that an engine of any type develops mosthorse-power when it is running at a constant predetermined speed. Inordinary locomotive practice the deadload is started with the pistons attheir slowest travel. SO far as I know this is the universal practice.With my invention it is pos sible to start the load from zero and moveit to the maximum velocitywith an engine running at constant speed, thusenabling the operator to use the full` horse-power of his engine at alltimes. The result of this it is that very heavy loads can be started andaccelerated with comparatively small engines.

My invention consists in the combination and arrangement of partshereinafter described and claimed.

In the drawings, Figure 1 is an elevation of my device; Fig. 2, a planof the same, and Fig. 3 a plan of the speed-controlling transmittingmechanism.

1 and 2 represent axles, each carrying a pair of anged wheels 3. Mountedupon these axles is a frame 4, preferably of the construction shown,which consists of two parallel partial frames 5, each provided withguideways 6, which receive boxes 7, carried bythe axles. Mountedabove-these boxes are standards 8, which carry one end of anequalizingbar 9, extended so as to rest at its other end upon across-bar 10, connecting the two partial frames. Yoke 11, secured toequalizingbars 12, passes down and under a part ofthe frame. A spring 13is interposed between this yoke and the frame, so that the latter has avertical resilience relatively to the axle.

This construction of frame holds the axles inl alinement. Mounted onthis frame is an engine of an improved type; but I have shown one ofthree-cylinder explosion type. The

engine 14 is secured to the frame 4, formed by the partialy frames andcross-bars. The engine herein shown is self-starting and reversible.

Mounted on a secondary frame 15, which is pivoted at one end upon axle 1and resiliently suspended at the other end from frame 4 by means ofsprings 16, is a speed-varying mechanism of the type shown in LettersPatent to Reeves Pulley Company, No. 583,402, granted May 25, 1897, No.584,402, granted January 15, 1897, No. 588,354, granted August 17, 1897,and No. 603,067, granted April 26, 1898, which primarily consists of twoparallel shafts 17, each carrying a pair of cone-shaped driving elements18, splined to their respective shafts. The driving elements areprovided with projecting hubs, each of which bears against athrust-bearing. The corresponding thrustbearings are connected by levers19, pivoted half-way between the shafts, the said levers adapted tooscillate on their pivots and move one'pair of driving elements togetherand the other pair apart simultaneously therewith. A beveled-edgeddriving-belt is stretched between the driving elements, and as one pairmove together the belt assumes a larger driving diameter and the otherpair move apart and the belt assumes a smaller driving diameter, thusvarying the speed of one shaft relatively to the other. This mechanismin yits entirety is old and I make no claim thereon except in thecombination in which it is used. As before stated, this speed-varyingmechanism is rigidly mounted on frame 15. The lower shaft 17 carries aspur-pinion 20, which meshes with a spur-gear 21, carried by axle 1. Itwill here be noted that the lower shaft 17 and axle 1 are held at agiven distance apart, thus keeping the pinion and gear in mesh at alltimes, but still relieving the mechanism from undue jar.

The upper Shaft 17 carries at its outer end a pulley 22, which is beltedto a belt-wheel 23,carriedbytheengine-shaft. Yokedaround upper shaft 17and around the engine crankshaft are boxes 24, which are connected byadjustable connecting-rods 25. In the form shown these connecting-rodsconsist of the ordinary turnbuckle. The object of these rods is totighten the belt by forcing the upper shaft away from the engine andpivotally IOO aroundthelowershaft. Afterthebeltis tight it will be notedthat these upper rods compel the shaft 17 to swing about the enginecrankshaft if there is any relative movement between them. This, it willbe noted, is considerable, as the main frame 4 is resilient on the axlesand has a vertical play, while the frame 15, carrying the speed-varyingmechanism, has an independent resilience around the axle l as a pivot.It will readily be seen that by this construction all the parts aremounted so as to be relieved from undue jar due to uneven road-bed andthat all parts are held in perfect alinement at all times.

The power developed by the engine is transmitted through the belt to theupper shaftof the speedcontrolling mechanism, from there tothe lowershaft, and through the pinion and gear to the axle.

The levers are oseillated by right and left hand screw-shaft- 26, whichis operated by a hand-wheel 27. Tith this arrangement the load can be`gradually taken up and accelerated while the engineds run continuousand any variation of speed can be attained.

I claim as my inventionl. The combination of a truck, an engine carriedthereby; a secondary framepivotally secured to one of the axles; aspeed-varying device carried by said frame; a power-transmittingconnection between the engine and speed-varying device; and apower-transmitting connection between the speed-varying device and axlesof the truck, substantially as and for the purpose set forth.

2. The combination with a truck, of an engine, a shaft connectedtherewith by powertransmission mechanism, a pair of coneshaped drivingelements carried by said shaft; a second shaft carryinga second pair ofdriving elements, a belt connecting the pairs of elements, means formoving one pair together and the other pair apart simultaneously, and apower-transmission connection between the second shaft and axles of thetruck substantially as specified.

3. The combination with a truck, an engine, a shaft connected therewithby power-transmission mechanism, a spacing connection between the engineand shaft, a pair of coneshaped driving elements carried by the shaft, asecond shaft carrying a second pair of coneshaped driving elements, abelt connecting the pairs, means for moving one pair together and theother pairapart simultaneously, and a power-transmission connectionbetween the second shaft and axles of the truck, substantially as andfor the purpose set forth.

4. The combination with a truck, of an engine, a shaft connectedtherewith by powertransmission mechanism, an adjustable connectionbetween the engine and shaft; a pair of cone-shaped driving elementscarried by the shaft; a second shaft carryin'g a second pair ofcone-shaped driving elements; a belt connecting the pairs means formoving one pair together and the other pair apart simultaneousl y, and apower-transmission connection between the second shaft and axles of thetruck, substantially asspecified for the purpose set forth.

5. The combination of a truck, an engine carried thereby, a secondaryframe pivotally secured to one of the axles; a shaft mounted on saidsecondary frame and carrying a pinion engaging with a gear on the axleof the truck; a pairof cone-shaped driving elements spline-mounted onsaid shaft; a second shaft supported on said secondary frame, a pair ofcone-shaped driving elements, spline-mounted thereon; a belt connectingthe pair of driving elements, means for simultaneously sliding thedriving elements on the shafts in opposite directions, and means fortransmitting power from the engine to the second shaft, substantially asand for the purpose set forth.

(5. The combination of a truck, an engine carried thereby, a secondaryframe pivotally secured to one of the axles; a shaft mounted on saidsecondary frame and carrying a pinion engaging with a gear on the axleof the truck; a pair of con e-shaped driving elements, spline-mounted onsaid shaft; a second shaft supported on said secondary frame, a pair ofcone-shaped driving elements, spline-mounted thereon; an adjustableconnection between the engine and second shaft; a belt connecting thepair of driving elements, means for simultaneously sliding the drivingelements on their shafts in opposite directions, and means fortransmitting power from the engine to the second shaft, substantially asand for the purpose set forth.

'7. The combination of a truck, an engine carried thereby, a secondaryframe pivotally secured to one of the axles at one end and re silientlysuspended from the'truck-frame at the other; a shaft mounted on saidsecondary frame and carrying a pinion engaging with a gear on the axleof the truck; a pair of cone-shaped driving elements, spline-mounted onsaid shaft; a second shaft supported on said secondary frame, a pair ofcone-shaped driving elements, spline-mounted thereon; a belt connectingthe pair of driving elements, means for simultaneously sliding thedriving elements on their shafts in opposite directions, and means fortransmitting power from theengine to the second shaft, substantially asand for the purpose set forth.

8. The combination of the main truck, of an engine carried thereby; asecondary frame pivotally secured to one of the axles, a speedvaryingdevice of the class described carried by said secondary frame, and anadjustable connection pivotally secured to the engine and pivotallysecured to the speed-varying mechanism substantially as and for thepurpose set forth.

JESSE M. THOMPSON.

Witnesses: ERNEST K. Hoon, CATHARINE HEIGH.

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